Modified unittest to use new argument syntax.

tests/html/form_element_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library('FormElementTest');
 
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 void main() {
   useHtmlConfiguration();
 
   test('constructorTest1', () {
     var form = new FormElement();
     expect(form, isNotNull);
-    expect(form is FormElement);
+    expect(form, new isInstanceOf<FormElement>('FormElement'));
   });
 
   test('checkValidityTest', () {
     var form = new FormElement();
     form.innerHTML = '<label>Google: <input type="search" name="q"></label> '
                      '<input type="submit" value="Search...">';
     expect(form.checkValidity(), isTrue);
     // TODO(efortuna): Issue 4832.
     form.innerHTML = '<input type="email" value="notemail" blaber="test"'
                      ' required>';
@@ skipping 46 matching lines @@
     form.noValidate = true;
     expect(form.noValidate, true);
   });
   
   test('targetTest', () {
     var target = 'target';
     form.target = target;
     expect(form.target, target);
   });
 }